Neutrino Physics Opportunities with the IsoDAR Source at Yemilab

TL;DR

The paper discusses the physics potential of the IsoDAR neutrino source at Yemilab, focusing on neutrino oscillation sensitivity, weak interaction tests, and searches for new particles like light $X$ bosons.

Contribution

It presents the capabilities of IsoDAR@Yemilab for short-baseline neutrino oscillation studies, weak mixing angle measurements, and new particle searches, with detailed sensitivity analyses.

Findings

Sensitivity to neutrino oscillations via inverse beta decay

Potential to measure the weak mixing angle through elastic scattering

Ability to detect light $X$ bosons decaying into neutrinos

Abstract

IsoDAR seeks to place a high-power-cyclotron and target combination, as an intense source of $\bar{\nu}_e$ at the level of $\sim 10^{23}$/year, close to a kiloton-scale neutrino detector in order to gain sensitivity to very short-baseline neutrino oscillations ($\bar{\nu}_e \rightarrow \bar{\nu}_{e}$) and perform precision tests of the weak interaction, among other physics opportunities. Recently, IsoDAR has received preliminary approval to be paired with the 2.26~kton target volume liquid scintillator detector at the Yemi Underground Laboratory (Yemilab) in Korea, at a 17~m center-to-center baseline, and cavern excavation for IsoDAR is now complete. In this paper, we present the physics capabilities of IsoDAR@Yemilab in terms of sensitivity to oscillations (via inverse beta decay, IBD; $\bar{\nu}_e+p \rightarrow e^+ + n$), including initial-state wavepacket effects, and the weak mixing angle (via elastic scattering off atomic electrons, $\bar{\nu}_e + e^- \rightarrow \bar{\nu}_e + e^-$). We also introduce a study of IsoDAR sensitivity to new particles, such as a light $X$ boson, produced in the target that decays to $\nu_e \bar \nu_e$.